/Engine/Source/Runtime/Engine/Classes/Engine/InstancedStaticMesh.h
Should be always constructed on main thread.
FPerInstanceRenderData ( [FStaticMeshInstanceData](API\Runtime\Engine\FStaticMeshInstanceData) & Other, [ERHIFeatureLevel::Type](API\Runtime\RHI\ERHIFeatureLevel__Type) InFeaureLevel, bool InRequireCPUAccess, FBox InBounds, bool bTrack, bool bDeferGPUUploadIn )